libtommath/demo/test.c

#include "shared.h"

static int test_trivial_stuff(void)
{
   mp_int a, b, c, d;
   if (mp_init_multi(&a, &b, &c, &d, NULL)!= MP_OKAY) {
      return EXIT_FAILURE;
   }

   /* a: 0->5 */
   mp_set_int(&a, 5uL);
   /* a: 5-> b: -5 */
   mp_neg(&a, &b);
   if (mp_cmp(&a, &b) != MP_GT) {
      goto LBL_ERR;
   }
   if (mp_cmp(&b, &a) != MP_LT) {
      goto LBL_ERR;
   }
   /* a: 5-> a: -5 */
   mp_neg(&a, &a);
   if (mp_cmp(&b, &a) != MP_EQ) {
      goto LBL_ERR;
   }
   /* a: -5-> b: 5 */
   mp_abs(&a, &b);
   if (mp_isneg(&b) != MP_NO) {
      goto LBL_ERR;
   }
   /* a: -5-> b: -4 */
   mp_add_d(&a, 1uL, &b);
   if (mp_isneg(&b) != MP_YES) {
      goto LBL_ERR;
   }
   if (mp_get_int(&b) != 4) {
      goto LBL_ERR;
   }
   /* a: -5-> b: 1 */
   mp_add_d(&a, 6uL, &b);
   if (mp_get_int(&b) != 1) {
      goto LBL_ERR;
   }
   /* a: -5-> a: 1 */
   mp_add_d(&a, 6uL, &a);
   if (mp_get_int(&a) != 1) {
      goto LBL_ERR;
   }
   mp_zero(&a);
   /* a: 0-> a: 6 */
   mp_add_d(&a, 6uL, &a);
   if (mp_get_int(&a) != 6) {
      goto LBL_ERR;
   }

   mp_set_int(&a, 42uL);
   mp_set_int(&b, 1uL);
   mp_neg(&b, &b);
   mp_set_int(&c, 1uL);
   mp_exptmod(&a, &b, &c, &d);

   mp_set_int(&c, 7uL);
   mp_exptmod(&a, &b, &c, &d);

   mp_clear_multi(&a, &b, &c, &d, NULL);
   return EXIT_SUCCESS;
LBL_ERR:
   mp_clear_multi(&a, &b, &c, &d, NULL);
   return EXIT_FAILURE;
}

static int very_random_source(void *out, size_t size)
{
   memset(out, 0xff, size);
   return MP_OKAY;
}

static int test_mp_rand(void)
{
   mp_int a, b;
   int err, n;
   if (mp_init_multi(&a, &b, NULL)!= MP_OKAY) {
      return EXIT_FAILURE;
   }
   mp_rand_source(very_random_source);
   for (n = 1; n < 1024; ++n) {
      if ((err = mp_rand(&a, n)) != MP_OKAY) {
         printf("Failed mp_rand() %s.\n", mp_error_to_string(err));
         break;
      }
      if ((err = mp_incr(&a)) != MP_OKAY) {
         printf("Failed mp_incr() %s.\n", mp_error_to_string(err));
         break;
      }
      if ((err = mp_div_2d(&a, n * MP_DIGIT_BIT, &b, NULL)) != MP_OKAY) {
         printf("Failed mp_div_2d() %s.\n", mp_error_to_string(err));
         break;
      }
      if (mp_cmp_d(&b, 1) != MP_EQ) {
         ndraw(&a, "mp_rand() a");
         ndraw(&b, "mp_rand() b");
         err = MP_ERR;
         break;
      }
   }
   mp_rand_source(NULL);
   mp_clear_multi(&a, &b, NULL);
   return err == MP_OKAY ? EXIT_SUCCESS : EXIT_FAILURE;
}

static int test_mp_jacobi(void)
{
   struct mp_jacobi_st {
      unsigned long n;
      int c[16];
   };

   static struct mp_jacobi_st jacobi[] = {
      { 3, {  1, -1,  0,  1, -1,  0,  1, -1,  0,  1, -1,  0,  1, -1,  0,  1 } },
      { 5, {  0,  1, -1, -1,  1,  0,  1, -1, -1,  1,  0,  1, -1, -1,  1,  0 } },
      { 7, {  1, -1,  1, -1, -1,  0,  1,  1, -1,  1, -1, -1,  0,  1,  1, -1 } },
      { 9, { -1,  1,  0,  1,  1,  0,  1,  1,  0,  1,  1,  0,  1,  1,  0,  1 } },
   };

   int i, n, err, should, cnt;

   mp_int a, b;
   if (mp_init_multi(&a, &b, NULL)!= MP_OKAY) {
      return EXIT_FAILURE;
   }

   mp_set_int(&a, 0uL);
   mp_set_int(&b, 1uL);
   if ((err = mp_jacobi(&a, &b, &i)) != MP_OKAY) {
      printf("Failed executing mp_jacobi(0 | 1) %s.\n", mp_error_to_string(err));
      goto LBL_ERR;
   }
   if (i != 1) {
      printf("Failed trivial mp_jacobi(0 | 1) %d != 1\n", i);
      goto LBL_ERR;
   }
   for (cnt = 0; cnt < (int)(sizeof(jacobi)/sizeof(jacobi[0])); ++cnt) {
      mp_set_int(&b, jacobi[cnt].n);
      /* only test positive values of a */
      for (n = -5; n <= 10; ++n) {
         mp_set_int(&a, (unsigned int)abs(n));
         should = MP_OKAY;
         if (n < 0) {
            mp_neg(&a, &a);
            /* Until #44 is fixed the negative a's must fail */
            should = MP_VAL;
         }
         if ((err = mp_jacobi(&a, &b, &i)) != should) {
            printf("Failed executing mp_jacobi(%d | %lu) %s.\n", n, jacobi[cnt].n, mp_error_to_string(err));
            goto LBL_ERR;
         }
         if ((err == MP_OKAY) && (i != jacobi[cnt].c[n + 5])) {
            printf("Failed trivial mp_jacobi(%d | %lu) %d != %d\n", n, jacobi[cnt].n, i, jacobi[cnt].c[n + 5]);
            goto LBL_ERR;
         }
      }
   }

   mp_clear_multi(&a, &b, NULL);
   return EXIT_SUCCESS;
LBL_ERR:
   mp_clear_multi(&a, &b, NULL);
   return EXIT_FAILURE;
}

static int test_mp_kronecker(void)
{
   struct mp_kronecker_st {
      long n;
      int c[21];
   };
   static struct mp_kronecker_st kronecker[] = {
      /*-10, -9, -8, -7,-6, -5, -4, -3, -2, -1, 0, 1,  2,  3, 4,  5,  6,  7,  8, 9, 10*/
      { -10, {  0, -1,  0, -1, 0,  0,  0,  1,  0, -1, 0, 1,  0, -1, 0,  0,  0,  1,  0, 1,  0  } },
      {  -9, { -1,  0, -1,  1, 0, -1, -1,  0, -1, -1, 0, 1,  1,  0, 1,  1,  0, -1,  1, 0,  1  } },
      {  -8, {  0, -1,  0,  1, 0,  1,  0, -1,  0, -1, 0, 1,  0,  1, 0, -1,  0, -1,  0, 1,  0  } },
      {  -7, {  1, -1, -1,  0, 1,  1, -1,  1, -1, -1, 0, 1,  1, -1, 1, -1, -1,  0,  1, 1, -1  } },
      {  -6, {  0,  0,  0, -1, 0, -1,  0,  0,  0, -1, 0, 1,  0,  0, 0,  1,  0,  1,  0, 0,  0  } },
      {  -5, {  0, -1,  1, -1, 1,  0, -1, -1,  1, -1, 0, 1, -1,  1, 1,  0, -1,  1, -1, 1,  0  } },
      {  -4, {  0, -1,  0,  1, 0, -1,  0,  1,  0, -1, 0, 1,  0, -1, 0,  1,  0, -1,  0, 1,  0  } },
      {  -3, { -1,  0,  1, -1, 0,  1, -1,  0,  1, -1, 0, 1, -1,  0, 1, -1,  0,  1, -1, 0,  1  } },
      {  -2, {  0, -1,  0,  1, 0,  1,  0, -1,  0, -1, 0, 1,  0,  1, 0, -1,  0, -1,  0, 1,  0  } },
      {  -1, { -1, -1, -1,  1, 1, -1, -1,  1, -1, -1, 1, 1,  1, -1, 1,  1, -1, -1,  1, 1,  1  } },
      {   0, {  0,  0,  0,  0, 0,  0,  0,  0,  0,  1, 0, 1,  0,  0, 0,  0,  0,  0,  0, 0,  0  } },
      {   1, {  1,  1,  1,  1, 1,  1,  1,  1,  1,  1, 1, 1,  1,  1, 1,  1,  1,  1,  1, 1,  1  } },
      {   2, {  0,  1,  0,  1, 0, -1,  0, -1,  0,  1, 0, 1,  0, -1, 0, -1,  0,  1,  0, 1,  0  } },
      {   3, {  1,  0, -1, -1, 0, -1,  1,  0, -1,  1, 0, 1, -1,  0, 1, -1,  0, -1, -1, 0,  1  } },
      {   4, {  0,  1,  0,  1, 0,  1,  0,  1,  0,  1, 0, 1,  0,  1, 0,  1,  0,  1,  0, 1,  0  } },
      {   5, {  0,  1, -1, -1, 1,  0,  1, -1, -1,  1, 0, 1, -1, -1, 1,  0,  1, -1, -1, 1,  0  } },
      {   6, {  0,  0,  0, -1, 0,  1,  0,  0,  0,  1, 0, 1,  0,  0, 0,  1,  0, -1,  0, 0,  0  } },
      {   7, { -1,  1,  1,  0, 1, -1,  1,  1,  1,  1, 0, 1,  1,  1, 1, -1,  1,  0,  1, 1, -1  } },
      {   8, {  0,  1,  0,  1, 0, -1,  0, -1,  0,  1, 0, 1,  0, -1, 0, -1,  0,  1,  0, 1,  0  } },
      {   9, {  1,  0,  1,  1, 0,  1,  1,  0,  1,  1, 0, 1,  1,  0, 1,  1,  0,  1,  1, 0,  1  } },
      {  10, {  0,  1,  0, -1, 0,  0,  0,  1,  0,  1, 0, 1,  0,  1, 0,  0,  0, -1,  0, 1,  0  } }
   };

   long k, m;
   int i, err, cnt;

   mp_int a, b;
   if (mp_init_multi(&a, &b, NULL)!= MP_OKAY) {
      return EXIT_FAILURE;
   }

   mp_set_int(&a, 0uL);
   mp_set_int(&b, 1uL);
   if ((err = mp_kronecker(&a, &b, &i)) != MP_OKAY) {
      printf("Failed executing mp_kronecker(0 | 1) %s.\n", mp_error_to_string(err));
      goto LBL_ERR;
   }
   if (i != 1) {
      printf("Failed trivial mp_kronecker(0 | 1) %d != 1\n", i);
      goto LBL_ERR;
   }
   for (cnt = 0; cnt < (int)(sizeof(kronecker)/sizeof(kronecker[0])); ++cnt) {
      k = kronecker[cnt].n;
      if (k < 0) {
         mp_set_int(&a, (unsigned long)(-k));
         mp_neg(&a, &a);
      } else {
         mp_set_int(&a, (unsigned long) k);
      }
      /* only test positive values of a */
      for (m = -10; m <= 10; m++) {
         if (m < 0) {
            mp_set_int(&b,(unsigned long)(-m));
            mp_neg(&b, &b);
         } else {
            mp_set_int(&b, (unsigned long) m);
         }
         if ((err = mp_kronecker(&a, &b, &i)) != MP_OKAY) {
            printf("Failed executing mp_kronecker(%ld | %ld) %s.\n", kronecker[cnt].n, m, mp_error_to_string(err));
            goto LBL_ERR;
         }
         if ((err == MP_OKAY) && (i != kronecker[cnt].c[m + 10])) {
            printf("Failed trivial mp_kronecker(%ld | %ld) %d != %d\n", kronecker[cnt].n, m, i, kronecker[cnt].c[m + 10]);
            goto LBL_ERR;
         }
      }
   }

   mp_clear_multi(&a, &b, NULL);
   return EXIT_SUCCESS;
LBL_ERR:
   mp_clear_multi(&a, &b, NULL);
   return EXIT_FAILURE;
}

static int test_mp_complement(void)
{
   int i;

   mp_int a, b, c;
   if (mp_init_multi(&a, &b, &c, NULL)!= MP_OKAY) {
      return EXIT_FAILURE;
   }

   for (i = 0; i < 1000; ++i) {
      long l = (rand() * rand() + 1) * (rand() % 1 ? -1 : 1);
      mp_set_long(&a, (unsigned long)labs(l));
      if (l < 0)
         mp_neg(&a, &a);
      mp_complement(&a, &b);

      l = ~l;
      mp_set_long(&c, (unsigned long)labs(l));
      if (l < 0)
         mp_neg(&c, &c);

      if (mp_cmp(&b, &c) != MP_EQ) {
         printf("\nmp_complement() bad result!");
         goto LBL_ERR;
      }
   }

   mp_clear_multi(&a, &b, &c, NULL);
   return EXIT_SUCCESS;
LBL_ERR:
   mp_clear_multi(&a, &b, &c, NULL);
   return EXIT_FAILURE;
}

static int test_mp_tc_div_2d(void)
{
   int i;

   mp_int a, b, d;
   if (mp_init_multi(&a, &b, &d, NULL)!= MP_OKAY) {
      return EXIT_FAILURE;
   }

   for (i = 0; i < 1000; ++i) {
      long l;
      int em;

      l = (rand() * rand() + 1) * (rand() % 1 ? -1 : 1);
      mp_set_long(&a, (unsigned long)labs(l));
      if (l < 0)
         mp_neg(&a, &a);

      em = rand() % 32;

      mp_set_long(&d, (unsigned long)labs(l >> em));
      if ((l >> em) < 0)
         mp_neg(&d, &d);

      mp_tc_div_2d(&a, em, &b);
      if (mp_cmp(&b, &d) != MP_EQ) {
         printf("\nmp_tc_div_2d() bad result!");
         goto LBL_ERR;
      }
   }

   mp_clear_multi(&a, &b, &d, NULL);
   return EXIT_SUCCESS;
LBL_ERR:
   mp_clear_multi(&a, &b, &d, NULL);
   return EXIT_FAILURE;

}

static int test_mp_tc_xor(void)
{
   int i;

   mp_int a, b, c, d;
   if (mp_init_multi(&a, &b, &c, &d, NULL)!= MP_OKAY) {
      return EXIT_FAILURE;
   }

   for (i = 0; i < 1000; ++i) {
      int l, em;

      l = (rand() * rand() + 1) * (rand() % 1 ? -1 : 1);
      mp_set_int(&a, (unsigned long)labs(l));
      if (l < 0)
         mp_neg(&a, &a);

      em = (rand() * rand() + 1) * (rand() % 1 ? -1 : 1);
      mp_set_int(&b, (unsigned long)labs(em));
      if (em < 0)
         mp_neg(&b, &b);

      mp_set_int(&d, (unsigned long)labs(l ^ em));
      if ((l ^ em) < 0)
         mp_neg(&d, &d);

      mp_tc_xor(&a, &b, &c);
      if (mp_cmp(&c, &d) != MP_EQ) {
         printf("\nmp_tc_xor() bad result!");
         goto LBL_ERR;
      }
   }

   mp_clear_multi(&a, &b, &c, &d, NULL);
   return EXIT_SUCCESS;
LBL_ERR:
   mp_clear_multi(&a, &b, &c, &d, NULL);
   return EXIT_FAILURE;

}

static int test_mp_tc_or(void)
{
   int i;

   mp_int a, b, c, d;
   if (mp_init_multi(&a, &b, &c, &d, NULL)!= MP_OKAY) {
      return EXIT_FAILURE;
   }

   for (i = 0; i < 1000; ++i) {
      long l, em;

      l = (rand() * rand() + 1) * (rand() % 1 ? -1 : 1);
      mp_set_long(&a, (unsigned long)labs(l));
      if (l < 0)
         mp_neg(&a, &a);

      em = (rand() * rand() + 1) * (rand() % 1 ? -1 : 1);
      mp_set_long(&b, (unsigned long)labs(em));
      if (em < 0)
         mp_neg(&b, &b);

      mp_set_long(&d, (unsigned long)labs(l | em));
      if ((l | em) < 0)
         mp_neg(&d, &d);

      mp_tc_or(&a, &b, &c);
      if (mp_cmp(&c, &d) != MP_EQ) {
         printf("\nmp_tc_or() bad result!");
         goto LBL_ERR;
      }
   }

   mp_clear_multi(&a, &b, &c, &d, NULL);
   return EXIT_SUCCESS;
LBL_ERR:
   mp_clear_multi(&a, &b, &c, &d, NULL);
   return EXIT_FAILURE;
}

static int test_mp_tc_and(void)
{
   int i;

   mp_int a, b, c, d;
   if (mp_init_multi(&a, &b, &c, &d, NULL)!= MP_OKAY) {
      return EXIT_FAILURE;
   }

   for (i = 0; i < 1000; ++i) {
      long l, em;

      l = (rand() * rand() + 1) * (rand() % 1 ? -1 : 1);
      mp_set_long(&a, (unsigned long)labs(l));
      if (l < 0)
         mp_neg(&a, &a);

      em = (rand() * rand() + 1) * (rand() % 1 ? -1 : 1);
      mp_set_long(&b, (unsigned long)labs(em));
      if (em < 0)
         mp_neg(&b, &b);

      mp_set_long(&d, (unsigned long)labs(l & em));
      if ((l & em) < 0)
         mp_neg(&d, &d);

      mp_tc_and(&a, &b, &c);
      if (mp_cmp(&c, &d) != MP_EQ) {
         printf("\nmp_tc_and() bad result!");
         goto LBL_ERR;
      }
   }

   mp_clear_multi(&a, &b, &c, &d, NULL);
   return EXIT_SUCCESS;
LBL_ERR:
   mp_clear_multi(&a, &b, &c, &d, NULL);
   return EXIT_FAILURE;
}

static int test_mp_invmod(void)
{
   mp_int a, b, c, d;
   if (mp_init_multi(&a, &b, &c, &d, NULL)!= MP_OKAY) {
      return EXIT_FAILURE;
   }

   /* mp_invmod corner-case of https://github.com/libtom/libtommath/issues/118 */
   {
      const char *a_ = "47182BB8DF0FFE9F61B1F269BACC066B48BA145D35137D426328DC3F88A5EA44";
      const char *b_ = "FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFF";
      const char *should_ = "0521A82E10376F8E4FDEF9A32A427AC2A0FFF686E00290D39E3E4B5522409596";

      if (mp_read_radix(&a, a_, 16) != MP_OKAY) {
         printf("\nmp_read_radix(a) failed!");
         goto LBL_ERR;
      }
      if (mp_read_radix(&b, b_, 16) != MP_OKAY) {
         printf("\nmp_read_radix(b) failed!");
         goto LBL_ERR;
      }
      if (mp_read_radix(&c, should_, 16) != MP_OKAY) {
         printf("\nmp_read_radix(should) failed!");
         goto LBL_ERR;
      }

      if (mp_invmod(&a, &b, &d) != MP_OKAY) {
         printf("\nmp_invmod() failed!");
         goto LBL_ERR;
      }

      if (mp_cmp(&c, &d) != MP_EQ) {
         printf("\nmp_invmod() bad result!");
         goto LBL_ERR;
      }
   }

   mp_clear_multi(&a, &b, &c, &d, NULL);
   return EXIT_SUCCESS;
LBL_ERR:
   mp_clear_multi(&a, &b, &c, &d, NULL);
   return EXIT_FAILURE;

}

static int test_mp_set_double(void)
{
   int i;

   mp_int a, b;
   if (mp_init_multi(&a, &b, NULL)!= MP_OKAY) {
      return EXIT_FAILURE;
   }

   /* test mp_get_double/mp_set_double */
#if defined(__STDC_IEC_559__) || defined(__GCC_IEC_559)
   if (mp_set_double(&a, +1.0/0.0) != MP_VAL) {
      printf("\nmp_set_double should return MP_VAL for +inf");
      goto LBL_ERR;
   }
   if (mp_set_double(&a, -1.0/0.0) != MP_VAL) {
      printf("\nmp_set_double should return MP_VAL for -inf");
      goto LBL_ERR;
   }
   if (mp_set_double(&a, +0.0/0.0) != MP_VAL) {
      printf("\nmp_set_double should return MP_VAL for NaN");
      goto LBL_ERR;
   }
   if (mp_set_double(&a, -0.0/0.0) != MP_VAL) {
      printf("\nmp_set_double should return MP_VAL for NaN");
      goto LBL_ERR;
   }

   for (i = 0; i < 1000; ++i) {
      int tmp = rand();
      double dbl = (double)tmp * rand() + 1;
      if (mp_set_double(&a, dbl) != MP_OKAY) {
         printf("\nmp_set_double() failed");
         goto LBL_ERR;
      }
      if (dbl != mp_get_double(&a)) {
         printf("\nmp_get_double() bad result!");
         goto LBL_ERR;
      }
      if (mp_set_double(&a, -dbl) != MP_OKAY) {
         printf("\nmp_set_double() failed");
         goto LBL_ERR;
      }
      if (-dbl != mp_get_double(&a)) {
         printf("\nmp_get_double() bad result!");
         goto LBL_ERR;
      }
   }
#endif

   mp_clear_multi(&a, &b, NULL);
   return EXIT_SUCCESS;
LBL_ERR:
   mp_clear_multi(&a, &b, NULL);
   return EXIT_FAILURE;

}

static int test_mp_get_int(void)
{
   unsigned long t;
   int i;

   mp_int a, b;
   if (mp_init_multi(&a, &b, NULL)!= MP_OKAY) {
      return EXIT_FAILURE;
   }

   for (i = 0; i < 1000; ++i) {
      t = (unsigned long)(rand() * rand() + 1) & 0xFFFFFFFFuL;
      mp_set_int(&a, t);
      if (t != mp_get_int(&a)) {
         printf("\nmp_get_int() bad result!");
         goto LBL_ERR;
      }
   }
   mp_set_int(&a, 0uL);
   if (mp_get_int(&a) != 0) {
      printf("\nmp_get_int() bad result!");
      goto LBL_ERR;
   }
   mp_set_int(&a, 0xFFFFFFFFuL);
   if (mp_get_int(&a) != 0xFFFFFFFFuL) {
      printf("\nmp_get_int() bad result!");
      goto LBL_ERR;
   }

   mp_clear_multi(&a, &b, NULL);
   return EXIT_SUCCESS;
LBL_ERR:
   mp_clear_multi(&a, &b, NULL);
   return EXIT_FAILURE;
}

static int test_mp_get_long(void)
{
   unsigned long s, t;
   int i;

   mp_int a, b;
   if (mp_init_multi(&a, &b, NULL)!= MP_OKAY) {
      return EXIT_FAILURE;
   }

   for (i = 0; i < ((int)(sizeof(unsigned long)*CHAR_BIT) - 1); ++i) {
      t = (1UL << (i+1)) - 1;
      if (!t)
         t = ~0UL;
      printf(" t = 0x%lx i = %d\r", t, i);
      do {
         mp_set_long(&a, t);
         s = mp_get_long(&a);
         if (s != t) {
            printf("\nmp_get_long() bad result! 0x%lx != 0x%lx", s, t);
            goto LBL_ERR;
         }
         t <<= 1;
      } while (t != 0uL);
   }

   mp_clear_multi(&a, &b, NULL);
   return EXIT_SUCCESS;
LBL_ERR:
   mp_clear_multi(&a, &b, NULL);
   return EXIT_FAILURE;
}

static int test_mp_get_long_long(void)
{
   unsigned long long q, r;
   int i;

   mp_int a, b;
   if (mp_init_multi(&a, &b, NULL)!= MP_OKAY) {
      return EXIT_FAILURE;
   }

   for (i = 0; i < ((int)(sizeof(unsigned long long)*CHAR_BIT) - 1); ++i) {
      r = (1ULL << (i+1)) - 1;
      if (!r)
         r = ~0ULL;
      printf(" r = 0x%llx i = %d\r", r, i);
      do {
         mp_set_long_long(&a, r);
         q = mp_get_long_long(&a);
         if (q != r) {
            printf("\nmp_get_long_long() bad result! 0x%llx != 0x%llx", q, r);
            goto LBL_ERR;
         }
         r <<= 1;
      } while (r != 0uLL);
   }

   mp_clear_multi(&a, &b, NULL);
   return EXIT_SUCCESS;
LBL_ERR:
   mp_clear_multi(&a, &b, NULL);
   return EXIT_FAILURE;

}

static int test_mp_sqrt(void)
{
   int i, n;

   mp_int a, b, c, d;
   if (mp_init_multi(&a, &b, &c, &d, NULL)!= MP_OKAY) {
      return EXIT_FAILURE;
   }

   for (i = 0; i < 1000; ++i) {
      printf("%6d\r", i);
      fflush(stdout);
      n = (rand() & 15) + 1;
      mp_rand(&a, n);
      if (mp_sqrt(&a, &b) != MP_OKAY) {
         printf("\nmp_sqrt() error!");
         goto LBL_ERR;
      }
      mp_n_root_ex(&a, 2uL, &c, 0);
      mp_n_root_ex(&a, 2uL, &d, 1);
      if (mp_cmp_mag(&c, &d) != MP_EQ) {
         printf("\nmp_n_root_ex() bad result!");
         goto LBL_ERR;
      }
      if (mp_cmp_mag(&b, &c) != MP_EQ) {
         printf("mp_sqrt() bad result!\n");
         goto LBL_ERR;
      }
   }

   mp_clear_multi(&a, &b, &c, &d, NULL);
   return EXIT_SUCCESS;
LBL_ERR:
   mp_clear_multi(&a, &b, &c, &d, NULL);
   return EXIT_FAILURE;
}

static int test_mp_is_square(void)
{
   int i, n;

   mp_int a, b;
   if (mp_init_multi(&a, &b, NULL)!= MP_OKAY) {
      return EXIT_FAILURE;
   }

   for (i = 0; i < 1000; ++i) {
      printf("%6d\r", i);
      fflush(stdout);

      /* test mp_is_square false negatives */
      n = (rand() & 7) + 1;
      mp_rand(&a, n);
      mp_sqr(&a, &a);
      if (mp_is_square(&a, &n) != MP_OKAY) {
         printf("\nfn:mp_is_square() error!");
         goto LBL_ERR;
      }
      if (n == 0) {
         printf("\nfn:mp_is_square() bad result!");
         goto LBL_ERR;
      }

      /* test for false positives */
      mp_add_d(&a, 1uL, &a);
      if (mp_is_square(&a, &n) != MP_OKAY) {
         printf("\nfp:mp_is_square() error!");
         goto LBL_ERR;
      }
      if (n == 1) {
         printf("\nfp:mp_is_square() bad result!");
         goto LBL_ERR;
      }

   }
   printf("\n\n");

   mp_clear_multi(&a, &b, NULL);
   return EXIT_SUCCESS;
LBL_ERR:
   mp_clear_multi(&a, &b, NULL);
   return EXIT_FAILURE;
}

static int test_mp_sqrtmod_prime(void)
{
   struct mp_sqrtmod_prime_st {
      unsigned long p;
      unsigned long n;
      mp_digit r;
   };

   static struct mp_sqrtmod_prime_st sqrtmod_prime[] = {
      { 5, 14, 3 },
      { 7, 9, 4 },
      { 113, 2, 62 }
   };
   int i;

   mp_int a, b, c;
   if (mp_init_multi(&a, &b, &c, NULL)!= MP_OKAY) {
      return EXIT_FAILURE;
   }

   /* r^2 = n (mod p) */
   for (i = 0; i < (int)(sizeof(sqrtmod_prime)/sizeof(sqrtmod_prime[0])); ++i) {
      mp_set_int(&a, sqrtmod_prime[i].p);
      mp_set_int(&b, sqrtmod_prime[i].n);
      if (mp_sqrtmod_prime(&b, &a, &c) != MP_OKAY) {
         printf("Failed executing %d. mp_sqrtmod_prime\n", (i+1));
         goto LBL_ERR;
      }
      if (mp_cmp_d(&c, sqrtmod_prime[i].r) != MP_EQ) {
         printf("Failed %d. trivial mp_sqrtmod_prime\n", (i+1));
         ndraw(&c, "r");
         goto LBL_ERR;
      }
   }

   mp_clear_multi(&a, &b, &c, NULL);
   return EXIT_SUCCESS;
LBL_ERR:
   mp_clear_multi(&a, &b, &c, NULL);
   return EXIT_FAILURE;
}

static int test_mp_prime_rand(void)
{
   int ix, err;

   mp_int a, b;
   if (mp_init_multi(&a, &b, NULL)!= MP_OKAY) {
      return EXIT_FAILURE;
   }

   /* test for size */
   for (ix = 10; ix < 128; ix++) {
      printf("Testing (not safe-prime): %9d bits    \r", ix);
      fflush(stdout);
      err = mp_prime_rand(&a, 8, ix, (rand() & 1) ? 0 : MP_PRIME_2MSB_ON);
      if (err != MP_OKAY) {
         printf("\nfailed with error: %s\n", mp_error_to_string(err));
         goto LBL_ERR;
      }
      if (mp_count_bits(&a) != ix) {
         printf("Prime is %d not %d bits!!!\n", mp_count_bits(&a), ix);
         goto LBL_ERR;
      }
   }
   printf("\n");

   mp_clear_multi(&a, &b, NULL);
   return EXIT_SUCCESS;
LBL_ERR:
   mp_clear_multi(&a, &b, NULL);
   return EXIT_FAILURE;
}

static int test_mp_prime_is_prime(void)
{
   int ix, err, cnt;

   mp_int a, b;
   if (mp_init_multi(&a, &b, NULL)!= MP_OKAY) {
      return EXIT_FAILURE;
   }

   /* strong Miller-Rabin pseudoprime to the first 200 primes (F. Arnault) */
   puts("Testing mp_prime_is_prime() with Arnault's pseudoprime  803...901 \n");
   mp_read_radix(&a,
                 "91xLNF3roobhzgTzoFIG6P13ZqhOVYSN60Fa7Cj2jVR1g0k89zdahO9/kAiRprpfO1VAp1aBHucLFV/qLKLFb+zonV7R2Vxp1K13ClwUXStpV0oxTNQVjwybmFb5NBEHImZ6V7P6+udRJuH8VbMEnS0H8/pSqQrg82OoQQ2fPpAk6G1hkjqoCv5s/Yr",
                 64);
   mp_prime_is_prime(&a, 8, &cnt);
   if (cnt == MP_YES) {
      printf("Arnault's pseudoprime is not prime but mp_prime_is_prime says it is.\n");
      goto LBL_ERR;
   }
   /* About the same size as Arnault's pseudoprime */
   puts("Testing mp_prime_is_prime() with certified prime 2^1119 + 53\n");
   mp_set(&a, 1uL);
   mp_mul_2d(&a,1119,&a);
   mp_add_d(&a, 53uL, &a);
   err = mp_prime_is_prime(&a, 8, &cnt);
   /* small problem */
   if (err != MP_OKAY) {
      printf("\nfailed with error: %s\n", mp_error_to_string(err));
   }
   /* large problem */
   if (cnt == MP_NO) {
      printf("A certified prime is a prime but mp_prime_is_prime says it is not.\n");
   }
   if ((err != MP_OKAY) || (cnt == MP_NO)) {
      printf("prime tested was: ");
      mp_fwrite(&a,16,stdout);
      putchar('\n');
      goto LBL_ERR;
   }
   for (ix = 16; ix < 128; ix++) {
      printf("Testing (    safe-prime): %9d bits    \r", ix);
      fflush(stdout);
      err = mp_prime_rand(&a, 8, ix, ((rand() & 1) ? 0 : MP_PRIME_2MSB_ON) | MP_PRIME_SAFE);
      if (err != MP_OKAY) {
         printf("\nfailed with error: %s\n", mp_error_to_string(err));
         goto LBL_ERR;
      }
      if (mp_count_bits(&a) != ix) {
         printf("Prime is %d not %d bits!!!\n", mp_count_bits(&a), ix);
         goto LBL_ERR;
      }
      /* let's see if it's really a safe prime */
      mp_sub_d(&a, 1uL, &b);
      mp_div_2(&b, &b);
      err = mp_prime_is_prime(&b, 8, &cnt);
      /* small problem */
      if (err != MP_OKAY) {
         printf("\nfailed with error: %s\n", mp_error_to_string(err));
      }
      /* large problem */
      if (cnt == MP_NO) {
         printf("\nsub is not prime!\n");
      }
      if ((err != MP_OKAY) || (cnt == MP_NO)) {
         printf("prime tested was: ");
         mp_fwrite(&a,16,stdout);
         putchar('\n');
         printf("sub tested was: ");
         mp_fwrite(&b,16,stdout);
         putchar('\n');
         goto LBL_ERR;
      }

   }
   /* Check regarding problem #143 */
#ifndef MP_8BIT
   mp_read_radix(&a,
                 "FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9A63A3620FFFFFFFFFFFFFFFF",
                 16);
   err = mp_prime_strong_lucas_selfridge(&a, &cnt);
   /* small problem */
   if (err != MP_OKAY) {
      printf("\nmp_prime_strong_lucas_selfridge failed with error: %s\n", mp_error_to_string(err));
   }
   /* large problem */
   if (cnt == MP_NO) {
      printf("\n\nissue #143 - mp_prime_strong_lucas_selfridge FAILED!\n");
   }
   if ((err != MP_OKAY) || (cnt == MP_NO)) {
      printf("prime tested was: ");
      mp_fwrite(&a,16,stdout);
      putchar('\n');
      goto LBL_ERR;
   }
#endif

   printf("\n\n");

   mp_clear_multi(&a, &b, NULL);
   return EXIT_SUCCESS;
LBL_ERR:
   mp_clear_multi(&a, &b, NULL);
   return EXIT_FAILURE;

}

static int test_mp_montgomery_reduce(void)
{
   mp_digit mp;
   int ix, i, n;
   char buf[4096];

   mp_int a, b, c, d, e;
   if (mp_init_multi(&a, &b, &c, &d, &e, NULL)!= MP_OKAY) {
      return EXIT_FAILURE;
   }

   /* test montgomery */
   for (i = 1; i <= 10; i++) {
      if (i == 10)
         i = 1000;
      printf(" digit size: %2d\r", i);
      fflush(stdout);
      for (n = 0; n < 1000; n++) {
         mp_rand(&a, i);
         a.dp[0] |= 1;

         /* let's see if R is right */
         mp_montgomery_calc_normalization(&b, &a);
         mp_montgomery_setup(&a, &mp);

         /* now test a random reduction */
         for (ix = 0; ix < 100; ix++) {
            mp_rand(&c, 1 + abs(rand()) % (2*i));
            mp_copy(&c, &d);
            mp_copy(&c, &e);

            mp_mod(&d, &a, &d);
            mp_montgomery_reduce(&c, &a, mp);
            mp_mulmod(&c, &b, &a, &c);

            if (mp_cmp(&c, &d) != MP_EQ) {
/* *INDENT-OFF* */
               printf("d = e mod a, c = e MOD a\n");
               mp_todecimal(&a, buf); printf("a = %s\n", buf);
               mp_todecimal(&e, buf); printf("e = %s\n", buf);
               mp_todecimal(&d, buf); printf("d = %s\n", buf);
               mp_todecimal(&c, buf); printf("c = %s\n", buf);
               printf("compare no compare!\n"); goto LBL_ERR;
/* *INDENT-ON* */
            }
            /* only one big montgomery reduction */
            if (i > 10) {
               n = 1000;
               ix = 100;
            }
         }
      }
   }

   printf("\n\n");

   mp_clear_multi(&a, &b, &c, &d, &e, NULL);
   return EXIT_SUCCESS;
LBL_ERR:
   mp_clear_multi(&a, &b, &c, &d, &e, NULL);
   return EXIT_FAILURE;

}

static int test_mp_read_radix(void)
{
   char buf[4096];

   mp_int a;
   if (mp_init_multi(&a, NULL)!= MP_OKAY) {
      return EXIT_FAILURE;
   }

   mp_read_radix(&a, "123456", 10);
   mp_toradix_n(&a, buf, 10, 3);
   printf("a == %s\n", buf);
   mp_toradix_n(&a, buf, 10, 4);
   printf("a == %s\n", buf);
   mp_toradix_n(&a, buf, 10, 30);
   printf("a == %s\n", buf);

#if 0
   for (;;) {
      fgets(buf, sizeof(buf), stdin);
      mp_read_radix(&a, buf, 10);
      mp_prime_next_prime(&a, 5, 1);
      mp_toradix(&a, buf, 10);
      printf("%s, %lu\n", buf, a.dp[0] & 3);
   }
#endif

   mp_clear_multi(&a, NULL);
   return EXIT_SUCCESS;
}

static int test_mp_cnt_lsb(void)
{
   int ix;

   mp_int a, b;
   if (mp_init_multi(&a, &b, NULL)!= MP_OKAY) {
      return EXIT_FAILURE;
   }

   mp_set(&a, 1uL);
   for (ix = 0; ix < 1024; ix++) {
      if (mp_cnt_lsb(&a) != ix) {
         printf("Failed at %d, %d\n", ix, mp_cnt_lsb(&a));
         goto LBL_ERR;
      }
      mp_mul_2(&a, &a);
   }

   mp_clear_multi(&a, &b, NULL);
   return EXIT_SUCCESS;
LBL_ERR:
   mp_clear_multi(&a, &b, NULL);
   return EXIT_FAILURE;

}

static int test_mp_reduce_2k(void)
{
   int ix, cnt;

   mp_int a, b, c, d;
   if (mp_init_multi(&a, &b, &c, &d, NULL)!= MP_OKAY) {
      return EXIT_FAILURE;
   }

   /* test mp_reduce_2k */
   for (cnt = 3; cnt <= 128; ++cnt) {
      mp_digit tmp;

      mp_2expt(&a, cnt);
      mp_sub_d(&a, 2uL, &a);  /* a = 2**cnt - 2 */

      printf("\r %4d bits", cnt);
      printf("(%d)", mp_reduce_is_2k(&a));
      mp_reduce_2k_setup(&a, &tmp);
      printf("(%lu)", (unsigned long) tmp);
      for (ix = 0; ix < 1000; ix++) {
         if (!(ix & 127)) {
            printf(".");
            fflush(stdout);
         }
         mp_rand(&b, (cnt / MP_DIGIT_BIT + 1) * 2);
         mp_copy(&c, &b);
         mp_mod(&c, &a, &c);
         mp_reduce_2k(&b, &a, 2uL);
         if (mp_cmp(&c, &b) != MP_EQ) {
            printf("FAILED\n");
            goto LBL_ERR;
         }
      }
   }

   mp_clear_multi(&a, &b, &c, &d, NULL);
   return EXIT_SUCCESS;
LBL_ERR:
   mp_clear_multi(&a, &b, &c, &d, NULL);
   return EXIT_FAILURE;
}

static int test_mp_div_3(void)
{
   int cnt;

   mp_int a, b, c, d, e;
   if (mp_init_multi(&a, &b, &c, &d, &e, NULL)!= MP_OKAY) {
      return EXIT_FAILURE;
   }

   /* test mp_div_3  */
   mp_set(&d, 3uL);
   for (cnt = 0; cnt < 10000;) {
      mp_digit r2;

      if (!(++cnt & 127)) {
         printf("%9d\r", cnt);
         fflush(stdout);
      }
      mp_rand(&a, abs(rand()) % 128 + 1);
      mp_div(&a, &d, &b, &e);
      mp_div_3(&a, &c, &r2);

      if (mp_cmp(&b, &c) || mp_cmp_d(&e, r2)) {
         printf("\nmp_div_3 => Failure\n");
         goto LBL_ERR;
      }
   }
   printf("\nPassed div_3 testing");

   mp_clear_multi(&a, &b, &c, &d, &e, NULL);
   return EXIT_SUCCESS;
LBL_ERR:
   mp_clear_multi(&a, &b, &c, &d, &e, NULL);
   return EXIT_FAILURE;
}

static int test_mp_dr_reduce(void)
{
   mp_digit mp;
   int cnt;
   unsigned rr;
   int ix;

   mp_int a, b, c;
   if (mp_init_multi(&a, &b, &c, NULL)!= MP_OKAY) {
      return EXIT_FAILURE;
   }

   /* test the DR reduction */
   for (cnt = 2; cnt < 32; cnt++) {
      printf("\r%d digit modulus", cnt);
      mp_grow(&a, cnt);
      mp_zero(&a);
      for (ix = 1; ix < cnt; ix++) {
         a.dp[ix] = MP_MASK;
      }
      a.used = cnt;
      a.dp[0] = 3;

      mp_rand(&b, cnt - 1);
      mp_copy(&b, &c);

      rr = 0;
      do {
         if (!(rr & 127)) {
            printf(".");
            fflush(stdout);
         }
         mp_sqr(&b, &b);
         mp_add_d(&b, 1uL, &b);
         mp_copy(&b, &c);

         mp_mod(&b, &a, &b);
         mp_dr_setup(&a, &mp);
         mp_dr_reduce(&c, &a, mp);

         if (mp_cmp(&b, &c) != MP_EQ) {
            printf("Failed on trial %u\n", rr);
            goto LBL_ERR;
         }
      } while (++rr < 500);
      printf(" passed");
      fflush(stdout);
   }

   mp_clear_multi(&a, &b, &c, NULL);
   return EXIT_SUCCESS;
LBL_ERR:
   mp_clear_multi(&a, &b, &c, NULL);
   return EXIT_FAILURE;
}

static int test_mp_reduce_2k_l(void)
{
#   if LTM_DEMO_TEST_REDUCE_2K_L
   mp_int a, b;
   if (mp_init_multi(&a, &b, NULL)!= MP_OKAY) {
      return EXIT_FAILURE;
   }
   /* test the mp_reduce_2k_l code */
#      if LTM_DEMO_TEST_REDUCE_2K_L == 1
   /* first load P with 2^1024 - 0x2A434 B9FDEC95 D8F9D550 FFFFFFFF FFFFFFFF */
   mp_2expt(&a, 1024);
   mp_read_radix(&b, "2A434B9FDEC95D8F9D550FFFFFFFFFFFFFFFF", 16);
   mp_sub(&a, &b, &a);
#      elif LTM_DEMO_TEST_REDUCE_2K_L == 2
   /*  p = 2^2048 - 0x1 00000000 00000000 00000000 00000000 4945DDBF 8EA2A91D 5776399B B83E188F  */
   mp_2expt(&a, 2048);
   mp_read_radix(&b,
                 "1000000000000000000000000000000004945DDBF8EA2A91D5776399BB83E188F",
                 16);
   mp_sub(&a, &b, &a);
#      else
#         error oops
#      endif

   mp_todecimal(&a, buf);
   printf("\n\np==%s\n", buf);
   /* now mp_reduce_is_2k_l() should return */
   if (mp_reduce_is_2k_l(&a) != 1) {
      printf("mp_reduce_is_2k_l() return 0, should be 1\n");
      goto LBL_ERR;
   }
   mp_reduce_2k_setup_l(&a, &d);
   /* now do a million square+1 to see if it varies */
   mp_rand(&b, 64);
   mp_mod(&b, &a, &b);
   mp_copy(&b, &c);
   printf("Testing: mp_reduce_2k_l...");
   fflush(stdout);
   for (cnt = 0; cnt < (int)(1UL << 20); cnt++) {
      mp_sqr(&b, &b);
      mp_add_d(&b, 1uL, &b);
      mp_reduce_2k_l(&b, &a, &d);
      mp_sqr(&c, &c);
      mp_add_d(&c, 1uL, &c);
      mp_mod(&c, &a, &c);
      if (mp_cmp(&b, &c) != MP_EQ) {
         printf("mp_reduce_2k_l() failed at step %d\n", cnt);
         mp_tohex(&b, buf);
         printf("b == %s\n", buf);
         mp_tohex(&c, buf);
         printf("c == %s\n", buf);
         goto LBL_ERR;
      }
   }

   mp_clear_multi(&a, &b, NULL);
   return EXIT_SUCCESS;
LBL_ERR:
   mp_clear_multi(&a, &b, NULL);
   return EXIT_FAILURE;
#else
   return EXIT_SUCCESS;
#   endif /* LTM_DEMO_TEST_REDUCE_2K_L */
}
/* stripped down version of mp_radix_size. The faster version can be off by up t
o +3  */
static int s_rs(const mp_int *a, int radix, int *size)
{
   int     res, digs = 0;
   mp_int  t;
   mp_digit d;
   *size = 0;
   if (mp_iszero(a) == MP_YES) {
      *size = 2;
      return MP_OKAY;
   }
   if (radix == 2) {
      *size = mp_count_bits(a) + 1;
      return MP_OKAY;
   }
   if ((res = mp_init_copy(&t, a)) != MP_OKAY) {
      return res;
   }
   t.sign = MP_ZPOS;
   while (mp_iszero(&t) == MP_NO) {
      if ((res = mp_div_d(&t, (mp_digit)radix, &t, &d)) != MP_OKAY) {
         mp_clear(&t);
         return res;
      }
      ++digs;
   }
   mp_clear(&t);
   *size = digs + 1;
   return MP_OKAY;
}
static int test_mp_ilogb(void)
{
   mp_int a, lb;
   mp_digit d, base;
   int size;

   if (mp_init_multi(&a, &lb, NULL) != MP_OKAY) {
      goto LBL_ERR;
   }

   /*
     base   a    result
      0     x    MP_VAL
      1     x    MP_VAL
   */
   mp_set(&a, 42uL);
   base = 0uL;
   if (mp_ilogb(&a, base, &lb) != MP_VAL) {
      goto LBL_ERR;
   }
   base = 1uL;
   if (mp_ilogb(&a, base, &lb) != MP_VAL) {
      goto LBL_ERR;
   }
   /*
     base   a    result
      2     0    MP_VAL
      2     1    0
      2     2    1
      2     3    1
   */
   base = 2uL;
   mp_zero(&a);
   if (mp_ilogb(&a, base, &lb) != MP_VAL) {
      goto LBL_ERR;
   }

   for (d = 1; d < 4; d++) {
      mp_set(&a, d);
      if (mp_ilogb(&a, base, &lb) != MP_OKAY) {
         goto LBL_ERR;
      }
      if (mp_cmp_d(&lb, (d == 1)?0uL:1uL) != MP_EQ) {
         goto LBL_ERR;
      }
   }
   /*
    base   a    result
     3     0    MP_VAL
     3     1    0
     3     2    0
     3     3    1
   */
   base = 3uL;
   mp_zero(&a);
   if (mp_ilogb(&a, base, &lb) != MP_VAL) {
      goto LBL_ERR;
   }
   for (d = 1; d < 4; d++) {
      mp_set(&a, d);
      if (mp_ilogb(&a, base, &lb) != MP_OKAY) {
         goto LBL_ERR;
      }
      if (mp_cmp_d(&lb, (d < base)?0uL:1uL) != MP_EQ) {
         goto LBL_ERR;
      }
   }

   /*
     bases 2..64 with "a" a random large constant.
     The range of bases tested allows to check with
     radix_size.
   */
   if (mp_rand(&a, 10) != MP_OKAY) {
      goto LBL_ERR;
   }
   for (base = 2uL; base < 65uL; base++) {
      if (mp_ilogb(&a, base, &lb) != MP_OKAY) {
         goto LBL_ERR;
      }
      if (s_rs(&a,(int)base, &size) != MP_OKAY) {
         goto LBL_ERR;
      }
      /* radix_size includes the memory needed for '\0', too*/
      size -= 2;
      if (mp_cmp_d(&lb, (mp_digit)size) != MP_EQ) {
         goto LBL_ERR;
      }
   }

   /*
     bases 2..64 with "a" a random small constant to
     test the part of mp_ilogb that uses native types.
   */
   if (mp_rand(&a, 1) != MP_OKAY) {
      goto LBL_ERR;
   }
   for (base = 2uL; base < 65uL; base++) {
      if (mp_ilogb(&a, base, &lb) != MP_OKAY) {
         goto LBL_ERR;
      }
      if (s_rs(&a,(int)base, &size) != MP_OKAY) {
         goto LBL_ERR;
      }
      size -= 2;
      if (mp_cmp_d(&lb, (mp_digit)size) != MP_EQ) {
         goto LBL_ERR;
      }
   }

   /*Test upper edgecase with base MP_MASK and number (MP_MASK/2)*MP_MASK^10  */
   mp_set(&a, MP_MASK);
   if (mp_expt_d(&a, 10uL, &a) != MP_OKAY) {
      goto LBL_ERR;
   }
   if (mp_add_d(&a, (MP_MASK>>1), &a) != MP_OKAY) {
      goto LBL_ERR;
   }
   if (mp_ilogb(&a, MP_MASK, &lb) != MP_OKAY) {
      goto LBL_ERR;
   }
   if (mp_cmp_d(&lb, 10uL) != MP_EQ) {
      goto LBL_ERR;
   }

   mp_clear_multi(&a, &lb, NULL);
   return EXIT_SUCCESS;
LBL_ERR:
   mp_clear_multi(&a, &lb, NULL);
   return EXIT_FAILURE;
}

static int test_mp_incr(void)
{
   mp_int a, b;
   int e = MP_OKAY;

   if ((e = mp_init_multi(&a, &b, NULL)) != MP_OKAY) {
      goto LTM_ERR;
   }

   /* Does it increment inside the limits of a MP_xBIT limb? */
   mp_set(&a, MP_MASK/2);
   if ((e = mp_incr(&a)) != MP_OKAY) {
      goto LTM_ERR;
   }
   if (mp_cmp_d(&a, (MP_MASK/2uL) + 1uL) != MP_EQ) {
      goto LTM_ERR;
   }

   /* Does it increment outside of the limits of a MP_xBIT limb? */
   mp_set(&a, MP_MASK);
   mp_set(&b, MP_MASK);
   if ((e = mp_incr(&a)) != MP_OKAY) {
      goto LTM_ERR;
   }
   if ((e = mp_add_d(&b, 1uL, &b)) != MP_OKAY) {
      goto LTM_ERR;
   }
   if (mp_cmp(&a, &b) != MP_EQ) {
      goto LTM_ERR;
   }

   /* Does it increment from -1 to 0? */
   mp_set(&a, 1uL);
   a.sign = MP_NEG;
   if ((e = mp_incr(&a)) != MP_OKAY) {
      goto LTM_ERR;
   }
   if (mp_cmp_d(&a, 0uL) != MP_EQ) {
      goto LTM_ERR;
   }

   /* Does it increment from -(MP_MASK + 1) to -MP_MASK? */
   mp_set(&a, MP_MASK);
   if ((e = mp_add_d(&a, 1uL, &a)) != MP_OKAY) {
      goto LTM_ERR;
   }
   a.sign = MP_NEG;
   if ((e = mp_incr(&a)) != MP_OKAY) {
      goto LTM_ERR;
   }
   if (a.sign != MP_NEG) {
      goto LTM_ERR;
   }
   a.sign = MP_ZPOS;
   if (mp_cmp_d(&a, MP_MASK) != MP_EQ) {
      goto LTM_ERR;
   }

   mp_clear_multi(&a, &b, NULL);
   return EXIT_SUCCESS;
LTM_ERR:
   mp_clear_multi(&a, &b, NULL);
   return EXIT_FAILURE;
}

static int test_mp_decr(void)
{
   mp_int a, b;
   int e = MP_OKAY;

   if ((e = mp_init_multi(&a, &b, NULL)) != MP_OKAY) {
      goto LTM_ERR;
   }

   /* Does it decrement inside the limits of a MP_xBIT limb? */
   mp_set(&a, MP_MASK/2);
   if ((e = mp_decr(&a)) != MP_OKAY) {
      goto LTM_ERR;
   }
   if (mp_cmp_d(&a, (MP_MASK/2uL) - 1uL) != MP_EQ) {
      goto LTM_ERR;
   }

   /* Does it decrement outside of the limits of a MP_xBIT limb? */
   mp_set(&a, MP_MASK);
   if ((e = mp_add_d(&a, 1uL, &a)) != MP_OKAY) {
      goto LTM_ERR;
   }
   if ((e = mp_decr(&a)) != MP_OKAY) {
      goto LTM_ERR;
   }
   if (mp_cmp_d(&a, MP_MASK) != MP_EQ) {
      goto LTM_ERR;
   }

   /* Does it decrement from 0 to -1? */
   mp_zero(&a);
   if ((e = mp_decr(&a)) != MP_OKAY) {
      goto LTM_ERR;
   }
   if (a.sign == MP_NEG) {
      a.sign = MP_ZPOS;
      if (mp_cmp_d(&a, 1uL) != MP_EQ) {
         goto LTM_ERR;
      }
   } else {
      goto LTM_ERR;
   }


   /* Does it decrement from -MP_MASK to -(MP_MASK + 1)? */
   mp_set(&a, MP_MASK);
   a.sign = MP_NEG;
   mp_set(&b, MP_MASK);
   b.sign = MP_NEG;
   if ((e = mp_sub_d(&b, 1uL, &b)) != MP_OKAY) {
      goto LTM_ERR;
   }
   if ((e = mp_decr(&a)) != MP_OKAY) {
      goto LTM_ERR;
   }
   if (mp_cmp(&a, &b) != MP_EQ) {
      goto LTM_ERR;
   }

   mp_clear_multi(&a, &b, NULL);
   return EXIT_SUCCESS;
LTM_ERR:
   mp_clear_multi(&a, &b, NULL);
   return EXIT_FAILURE;
}

/*
   Cannot test mp_exp(_d) without mp_n_root and vice versa.
   So one of the two has to be tested from scratch.

   Numbers generated by
   for i in {1..10}
   do
     seed=$(head -c 10000 /dev/urandom | tr -dc '[:digit:]' | head -c 120);
     echo $seed;
     convertbase $seed 10  64;
   done

   (The program "convertbase" uses libtommath's to/from_radix functions)

   Roots were precalculated with Pari/GP

   default(realprecision,1000);
   for(n=3,100,r = floor(a^(1/n));printf("\"" r "\", "))

   All numbers as strings to simplifiy things, especially for the
   low-mp branch.
*/
static int test_mp_n_root(void)
{
   mp_int a, c, r;
   int e;
   int i, j;

   const char *input[] = {
      "4n9cbk886QtLQmofprid3l2Q0GD8Yv979Lh8BdZkFE8g2pDUUSMBET/+M/YFyVZ3mBp",
      "5NlgzHhmIX05O5YoW5yW5reAlVNtRAlIcN2dfoATnNdc1Cw5lHZUTwNthmK6/ZLKfY6",
      "3gweiHDX+ji5utraSe46IJX+uuh7iggs63xIpMP5MriU4Np+LpHI5are8RzS9pKh9xP",
      "5QOJUSKMrfe7LkeyJOlupS8h7bjT+TXmZkDzOjZtfj7mdA7cbg0lRX3CuafhjIrpK8S",
      "4HtYFldVkyVbrlg/s7kmaA7j45PvLQm+1bbn6ehgP8tVoBmGbv2yDQI1iQQze4AlHyN",
      "3bwCUx79NAR7c68OPSp5ZabhZ9aBEr7rWNTO2oMY7zhbbbw7p6shSMxqE9K9nrTNucf",
      "4j5RGb78TfuYSzrXn0z6tiAoWiRI81hGY3el9AEa9S+gN4x/AmzotHT2Hvj6lyBpE7q",
      "4lwg30SXqZhEHNsl5LIXdyu7UNt0VTWebP3m7+WUL+hsnFW9xJe7UnzYngZsvWh14IE",
      "1+tcqFeRuGqjRADRoRUJ8gL4UUSFQVrVVoV6JpwVcKsuBq5G0pABn0dLcQQQMViiVRj",
      "hXwxuFySNSFcmbrs/coz4FUAaUYaOEt+l4V5V8vY71KyBvQPxRq/6lsSrG2FHvWDax"
   };
   /* roots 3-100 of the above */
   const char *root[10][100] = {
      {
         "9163694094944489658600517465135586130944",
         "936597377180979771960755204040", "948947857956884030956907",
         "95727185767390496595", "133844854039712620", "967779611885360",
         "20926191452627", "974139547476", "79203891950", "9784027073",
         "1667309744", "365848129", "98268452", "31109156", "11275351",
         "4574515", "2040800", "986985", "511525", "281431", "163096",
         "98914", "62437", "40832", "27556", "19127", "13614", "9913",
         "7367", "5577", "4294", "3357", "2662", "2138", "1738", "1428",
         "1185", "993", "839", "715", "613", "530", "461", "403", "355",
         "314", "279", "249", "224", "202", "182", "166", "151", "138",
         "126", "116", "107", "99", "92", "85", "79", "74", "69", "65", "61",
         "57", "54", "51", "48", "46", "43", "41", "39", "37", "36", "34",
         "32", "31", "30", "28", "27", "26", "25", "24", "23", "23", "22",
         "21", "20", "20", "19", "18", "18", "17", "17", "16", "16", "15"
      }, {
         "9534798256755061606359588498764080011382",
         "964902943621813525741417593772", "971822399862464674540423",
         "97646291566833512831", "136141536090599560", "982294733581430",
         "21204945933335", "985810529393", "80066084985", "9881613813",
         "1682654547", "368973625", "99051783", "31341581", "11354620",
         "4604882", "2053633", "992879", "514434", "282959", "163942",
         "99406", "62736", "41020", "27678", "19208", "13670", "9952",
         "7395", "5598", "4310", "3369", "2671", "2145", "1744", "1433",
         "1189", "996", "842", "717", "615", "531", "462", "404", "356",
         "315", "280", "250", "224", "202", "183", "166", "151", "138",
         "127", "116", "107", "99", "92", "85", "80", "74", "70", "65", "61",
         "58", "54", "51", "48", "46", "43", "41", "39", "37", "36", "34",
         "32", "31", "30", "29", "27", "26", "25", "24", "23", "23", "22",
         "21", "20", "20", "19", "18", "18", "17", "17", "16", "16", "15"
      }, {
         "8398539113202579297642815367509019445624",
         "877309458945432597462853440936", "900579899458998599215071",
         "91643543761699761637", "128935656335800903", "936647990947203",
         "20326748623514", "948988882684", "77342677787", "9573063447",
         "1634096832", "359076114", "96569670", "30604705", "11103188",
         "4508519", "2012897", "974160", "505193", "278105", "161251",
         "97842", "61788", "40423", "27291", "18949", "13492", "9826",
         "7305", "5532", "4260", "3332", "2642", "2123", "1726", "1418",
         "1177", "986", "834", "710", "610", "527", "458", "401", "353",
         "312", "278", "248", "223", "201", "181", "165", "150", "137",
         "126", "116", "107", "99", "91", "85", "79", "74", "69", "65", "61",
         "57", "54", "51", "48", "46", "43", "41", "39", "37", "35", "34",
         "32", "31", "30", "28", "27", "26", "25", "24", "23", "22", "22",
         "21", "20", "20", "19", "18", "18", "17", "17", "16", "16", "15"
      }, {
         "9559098494021810340217797724866627755195",
         "966746709063325235560830083787", "973307706084821682248292",
         "97770642291138756434", "136290128605981259", "983232784778520",
         "21222944848922", "986563584410", "80121684894", "9887903837",
         "1683643206", "369174929", "99102220", "31356542", "11359721",
         "4606836", "2054458", "993259", "514621", "283057", "163997",
         "99437", "62755", "41032", "27686", "19213", "13674", "9955",
         "7397", "5599", "4311", "3370", "2672", "2146", "1744", "1433",
         "1189", "996", "842", "717", "615", "532", "462", "404", "356",
         "315", "280", "250", "224", "202", "183", "166", "151", "138",
         "127", "116", "107", "99", "92", "86", "80", "74", "70", "65", "61",
         "58", "54", "51", "48", "46", "43", "41", "39", "37", "36", "34",
         "32", "31", "30", "29", "27", "26", "25", "24", "23", "23", "22",
         "21", "20", "20", "19", "18", "18", "17", "17", "16", "16", "15"
      }, {
         "8839202025813295923132694443541993309220",
         "911611499784863252820288596270", "928640961450376817534853",
         "94017030509441723821", "131792686685970629", "954783483196511",
         "20676214073400", "963660189823", "78428929840", "9696237956",
         "1653495486", "363032624", "97562430", "30899570", "11203842",
         "4547110", "2029216", "981661", "508897", "280051", "162331",
         "98469", "62168", "40663", "27446", "19053", "13563", "9877",
         "7341", "5558", "4280", "3347", "2654", "2132", "1733", "1424",
         "1182", "990", "837", "713", "612", "529", "460", "402", "354",
         "313", "279", "249", "223", "201", "182", "165", "150", "138",
         "126", "116", "107", "99", "92", "85", "79", "74", "69", "65", "61",
         "57", "54", "51", "48", "46", "43", "41", "39", "37", "36", "34",
         "32", "31", "30", "28", "27", "26", "25", "24", "23", "23", "22",
         "21", "20", "20", "19", "18", "18", "17", "17", "16", "16", "15"
      }, {
         "8338442683973420410660145045849076963795",
         "872596990706967613912664152945", "896707843885562730147307",
         "91315073695274540969", "128539440806486007", "934129001105825",
         "20278149285734", "946946589774", "77191347471", "9555892093",
         "1631391010", "358523975", "96431070", "30563524", "11089126",
         "4503126", "2010616", "973111", "504675", "277833", "161100",
         "97754", "61734", "40390", "27269", "18934", "13482", "9819",
         "7300", "5528", "4257", "3330", "2641", "2122", "1725", "1417",
         "1177", "986", "833", "710", "609", "527", "458", "401", "353",
         "312", "278", "248", "222", "200", "181", "165", "150", "137",
         "126", "116", "107", "99", "91", "85", "79", "74", "69", "65", "61",
         "57", "54", "51", "48", "46", "43", "41", "39", "37", "35", "34",
         "32", "31", "30", "28", "27", "26", "25", "24", "23", "22", "22",
         "21", "20", "20", "19", "18", "18", "17", "17", "16", "16", "15"
      }, {
         "9122818552483814953977703257848970704164",
         "933462289569511464780529972314", "946405863353935713909178",
         "95513446972056321834", "133588658082928446",
         "966158521967027", "20895030642048", "972833934108",
         "79107381638", "9773098125", "1665590516", "365497822",
         "98180628", "31083090", "11266459", "4571108", "2039360",
         "986323", "511198", "281260", "163001", "98858",
         "62404", "40811", "27543", "19117", "13608", "9908",
         "7363", "5575", "4292", "3356", "2661", "2138",
         "1737", "1428", "1185", "993", "839", "714", "613",
         "530", "461", "403", "355", "314", "279", "249",
         "224", "202", "182", "165", "151", "138", "126",
         "116", "107", "99", "92", "85", "79", "74", "69",
         "65", "61", "57", "54", "51", "48", "46", "43",
         "41", "39", "37", "36", "34", "32", "31", "30",
         "28", "27", "26", "25", "24", "23", "23", "22",
         "21", "20", "20", "19", "18", "18", "17", "17",
         "16", "16", "15"
      }, {
         "9151329724083804100369546479681933027521",
         "935649419557299174433860420387", "948179413831316112751907",
         "95662582675170358900", "133767426788182384",
         "967289728859610", "20916775466497", "973745045600",
         "79174731802", "9780725058", "1666790321", "365742295",
         "98241919", "31101281", "11272665", "4573486", "2040365",
         "986785", "511426", "281380", "163067", "98897",
         "62427", "40826", "27552", "19124", "13612", "9911",
         "7366", "5576", "4294", "3357", "2662", "2138",
         "1738", "1428", "1185", "993", "839", "715", "613",
         "530", "461", "403", "355", "314", "279", "249",
         "224", "202", "182", "165", "151", "138", "126",
         "116", "107", "99", "92", "85", "79", "74", "69",
         "65", "61", "57", "54", "51", "48", "46", "43",
         "41", "39", "37", "36", "34", "32", "31", "30",
         "28", "27", "26", "25", "24", "23", "23", "22",
         "21", "20", "20", "19", "18", "18", "17", "17",
         "16", "16", "15"
      }, {
         "6839396355168045468586008471269923213531",
         "752078770083218822016981965090", "796178899357307807726034",
         "82700643015444840424", "118072966296549115",
         "867224751770392", "18981881485802", "892288574037",
         "73130030771", "9093989389", "1558462688", "343617470",
         "92683740", "29448679", "10708016", "4356820", "1948676",
         "944610", "490587", "270425", "156989", "95362",
         "60284", "39477", "26675", "18536", "13208", "9627",
         "7161", "5426", "4181", "3272", "2596", "2087",
         "1697", "1395", "1159", "971", "821", "700", "601",
         "520", "452", "396", "348", "308", "274", "245",
         "220", "198", "179", "163", "148", "136", "124",
         "114", "106", "98", "91", "84", "78", "73", "68",
         "64", "60", "57", "53", "50", "48", "45", "43",
         "41", "39", "37", "35", "34", "32", "31", "29",
         "28", "27", "26", "25", "24", "23", "22", "22",
         "21", "20", "19", "19", "18", "18", "17", "17",
         "16", "16", "15"
      }, {
         "4788090721380022347683138981782307670424",
         "575601315594614059890185238256", "642831903229558719812840",
         "69196031110028430211", "101340693763170691",
         "758683936560287", "16854690815260", "801767985909",
         "66353290503", "8318415180", "1435359033", "318340531",
         "86304307", "27544217", "10054988", "4105446", "1841996",
         "895414", "466223", "257591", "149855", "91205",
         "57758", "37886", "25639", "17842", "12730", "9290",
         "6918", "5248", "4048", "3170", "2518", "2026",
         "1649", "1357", "1128", "946", "800", "682", "586",
         "507", "441", "387", "341", "302", "268", "240",
         "215", "194", "176", "160", "146", "133", "122",
         "112", "104", "96", "89", "83", "77", "72", "67",
         "63", "59", "56", "53", "50", "47", "45", "42",
         "40", "38", "36", "35", "33", "32", "30", "29",
         "28", "27", "26", "25", "24", "23", "22", "21",
         "21", "20", "19", "19", "18", "17", "17", "16",
         "16", "15", "15"
      }
   };

   if ((e = mp_init_multi(&a, &c, &r, NULL)) != MP_OKAY) {
      return EXIT_FAILURE;
   }
#ifdef MP_8BIT
   for (i = 0; i < 1; i++) {
#else
   for (i = 0; i < 10; i++) {
#endif
      mp_read_radix(&a, input[i], 64);
#ifdef MP_8BIT
      for (j = 3; j < 10; j++) {
#else
      for (j = 3; j < 100; j++) {
#endif
         mp_n_root(&a, (mp_digit) j, &c);
         mp_read_radix(&r, root[i][j-3], 10);
         if (mp_cmp(&r, &c) != MP_EQ) {
            fprintf(stderr, "mp_n_root failed at input #%d, root #%d\n", i, j);
            goto LTM_ERR;
         }
      }
   }
   mp_clear_multi(&a, &c, &r, NULL);
   return EXIT_SUCCESS;
LTM_ERR:
   mp_clear_multi(&a, &c, &r, NULL);
   return EXIT_FAILURE;
}

static int test_s_mp_balance_mul(void)
{
   mp_int a, b, c;
   int e = MP_OKAY;

   const char *na =
      "4b0I5uMTujCysw+1OOuOyH2FX2WymrHUqi8BBDb7XpkV/4i7vXTbEYUy/kdIfCKu5jT5JEqYkdmnn3jAYo8XShPzNLxZx9yoLjxYRyptSuOI2B1DspvbIVYXY12sxPZ4/HCJ4Usm2MU5lO/006KnDMxuxiv1rm6YZJZ0eZU";
   const char *nb = "3x9vs0yVi4hIq7poAeVcggC3WoRt0zRLKO";
   const char *nc =
      "HzrSq9WVt1jDTVlwUxSKqxctu2GVD+N8+SVGaPFRqdxyld6IxDBbj27BPJzYUdR96k3sWpkO8XnDBvupGPnehpQe4KlO/KmN1PjFov/UTZYM+LYzkFcBPyV6hkkL8ePC1rlFLAHzgJMBCXVp4mRqtkQrDsZXXlcqlbTFu69wF6zDEysiX2cAtn/kP9ldblJiwYPCD8hG";

   if ((e = mp_init_multi(&a, &b, &c, NULL)) != MP_OKAY) {
      goto LTM_ERR;
   }

   if ((e = mp_read_radix(&a, na, 64)) != MP_OKAY) {
      goto LTM_ERR;
   }
   if ((e = mp_read_radix(&b, nb, 64)) != MP_OKAY) {
      goto LTM_ERR;
   }

   if ((e = mp_mul(&a, &b, &c)) != MP_OKAY) {
      goto LTM_ERR;
   }

   if ((e = mp_read_radix(&b, nc, 64)) != MP_OKAY) {
      goto LTM_ERR;
   }

   if (mp_cmp(&b, &c) != MP_EQ) {
      goto LTM_ERR;
   }

   mp_clear_multi(&a, &b, &c, NULL);
   return EXIT_SUCCESS;
LTM_ERR:
   mp_clear_multi(&a, &b, &c, NULL);
   return EXIT_FAILURE;
}

int unit_tests(int argc, char **argv)
{
   static const struct {
      const char *name;
      int (*fn)(void);
   } test[] = {
#define T(n) { #n, test_##n }
      T(trivial_stuff),
      T(mp_cnt_lsb),
      T(mp_complement),
      T(mp_div_3),
      T(mp_dr_reduce),
      T(mp_get_int),
      T(mp_get_long),
      T(mp_get_long_long),
      T(mp_invmod),
      T(mp_is_square),
      T(mp_jacobi),
      T(mp_kronecker),
      T(mp_montgomery_reduce),
      T(mp_prime_is_prime),
      T(mp_prime_rand),
      T(mp_rand),
      T(mp_read_radix),
      T(mp_reduce_2k),
      T(mp_reduce_2k_l),
      T(mp_n_root),
      T(mp_set_double),
      T(mp_sqrt),
      T(mp_sqrtmod_prime),
      T(mp_tc_and),
      T(mp_tc_div_2d),
      T(mp_tc_or),
      T(mp_tc_xor),
      T(mp_incr),
      T(mp_decr),
      T(s_mp_balance_mul),
      T(mp_ilogb)
#undef T
   };
   unsigned long i;
   int res = EXIT_SUCCESS, j;

   for (i = 0; i < sizeof(test) / sizeof(test[0]); ++i) {
      if (argc > 1) {
         for (j = 1; j < argc; ++j) {
            if (strstr(test[i].name, argv[j]) != NULL) {
               break;
            }
         }
         if (j == argc) continue;
      }
      printf("TEST %s\n\n", test[i].name);
      if (test[i].fn() != EXIT_SUCCESS) {
         printf("\n\nFAIL %s\n\n", test[i].name);
         res = EXIT_FAILURE;
         break;
      }
      printf("\n\n");
   }

   return res;
}